Working-barrel tube



5. lvlNs. WORKING BARREL TUBE.

APPLICATION' FILED MAYIO, 1921.

Patented June 20, 1922.

l nnnwoon ivINsv-on -ri'rrnnrnrnrgrnrmsnvnma 1 To aZlZfwwm t concern.' I.

Be it known thatI, ELL'WooD IvINs, a citi- I zen of the United States, residing 4in Philadelphia, Pennsylvania, have invented certain Improvements in Working-Barrel Tubes, of

:which the following is a specification.

.The Vobject of my invention is to provide a working barrel tube, of the .type commonly employed in rock drills, pumps, and otherimplements, .having superior interior smoothvide a substantially self-lubricating tube.

f tubes, it is essential thatthe inside of .the tube'be extremely .smooth and accurately l the inside of the tube with a liningof a soft frictionfless metal such as lead, tin, or alloys' "of lead .and tin, Ialmable to obtain an ex` In the manufacture of working barrel surfaced. I have discovered that by coating `tremel'y smooth surface which will wear true .i acid, for a suitable length of timeto give. the desired coating'to the billet. lThe work.

and which will function also as an anti-V friction lining. A tube vso coated I illustrated in the attached drawing.

In forming my working barreltube,il". prethe tube blankor of the hollow billet from which the tube is* to be formed.` The aplif'- *cation may bemade lyany one of'a num er orwell knownmetho s,'such as for example '-immersing the hollow billetin bath of the molten metal, o1'. `in a solution of a compound of lead, such as lead acetate', water and acetic.

ing barrel tube isv then formed in lthe Ausual manner, thel billet 'being drawn .over a fixedv mandrel and through a xed die, and this drawing being repeated Aover successively smaller mandrels and through 'successively i i smaller dies until `the tubehasatt ained the desired'nished dimensions.

4of soft' metal.

L ELI- ;wooDfIvINs.

specification o'f ieders-Patent.' Patnted June 20', .1922. Application iledMay 10,1921, Serial No.' 468,336. I

' vIt has beenr found, completion ofthe 'i tube, that there remains a thin coating of the leador leadv alloy, orother metal, both over l the interior and exterior surfaces of the tube, the softv metalmaterial lling the small dewpressions in the tube' surface and leaving an" absolutely smoothsurfacee When the plung-4 .er or otherelement which is adapted to travel or reciprocate in the working 'barrel is ins erted and putinto operation, the said plunger or other element'quickly wears atrue surwearing qualities.

l. It wlll-be understood that ,v-although it is preferredjtoform the tube -coating 'inthe manner speclfied-abov'e, I do not wish to llimit the inventionftoany'particula'r method ofestablishing the coating, which 'may be l applied in any" desired 'and practicable man ner either. before -the drawing operations or afterward. f I claim: `fer to apply the soft metal to the surfaces of vsurface 'thereofa coating of a lsoft metal,

substantially as and for' the purpose set v forth.l

. 2. As anew article of manufacture, a -workln'g bar-rel tube having upon the inner surface thereofra fsoftmetal coating comprisvB. The vIn'etholel-` offinishing thel interior surfaceof working barrel tubes, which'con' slsts of providing said surface with a coating '8 5 

